Multi-Scale Polyimide/Carbon Fibers Hybrid Filters for Hot Gas Filtration

Abstract:

Increasing air pollution caused mainly by exhaust emission has become a serious concern for public health. In order to efficiently control the exhaust emission from the origin, hot gas filtration is required in many industries, such as thermal power regeneration, metal refining/recycling, and biomass/coal gasification. This study aimed to develop a hybrid filter composed with ultrafine fibrous polyimide (PI) filtration layers and carbon woven fabric supporting layers for hot gas filtration. Uniform PI ultrafine fibers around 200 nm with small pores about 2.2 μm were electrospun on carbon fabrics supporting layers to serve as the filtration layer. During filtration test, NaCl aerosols (0.3 mm), which mimicked PM 2.5 particles were accumulated on the top of filtration layer and formed dust cake, but limited aerosols were observed on the carbon fabric supporting layers. It was proved that PI fiber mats played the key role in filtration. The filtration efficiency could be maintained above 95% after 9 min and reached 99.4 %. This research proved that the multi-scale polyimide/carbon fibers hybrid filters possessed the potential to serve as filtration media in bag filters for hot gas filtration.

• Periodical: Materials Science Forum (Volume 814)
• Pages: 464-469
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.814.464
• Online since: March 2015
• Authors: Qian Nan Wang, Yu Ying Bai, Jian Fei Xie, Yi Ping Qiu*, Qiu Ran Jiang
• Keywords: Carbon Fibers, Filtration Efficiency, Hot Gas Filtration, Polyimide, Ultrafine Fibers

References

[1] J. Finley, Hot gas filtration: diesel – how prepared is the filtration industry?, Filtration & Separation. 43 (2006) 16-20.

DOI: 10.1016/s0015-1882(06)70863-1

[2] S.D. Sharma, M. Dolan, A.Y. Ilyushechkin, K.G. McLennan, T. Nguyen, D. Chase, Recent developments in dry hot syngas cleaning processes, Fuel. 89 (2010) 817-826.

DOI: 10.1016/j.fuel.2009.05.026

[3] E.H. Tanabe, P.M. Barros, K.B. Rodrigues, M.L. Aguiar, Experimental investigation of deposition and removal of particles during gas filtration with various fabric filters, Separation and Purification Technology. 80 (2011) 187-195.

DOI: 10.1016/j.seppur.2011.04.031

[4] A. Larbot, M. Bertrand, S. Marre, E. Prouzet, Performances of ceramic filters for air purification, Separation and Purification Technology. 32 (2003) 81-85.

DOI: 10.1016/s1383-5866(03)00062-5

[5] R.C. Brown, A. Thorpe, Glass-fibre filters with bimodal fibre size distributions, Powder Technology. 118 (2001) 3-9.

DOI: 10.1016/s0032-5910(01)00288-1

[6] T.J. Phelps, A.V. Palumbo, B.L. Bischoff, C.J. Miller, L.A. Fagan, M.S. McNeilly, R.R. Judkins, Micron-pore-sized metallic filter tube membranes for filtration of particulates and water purification, Journal of microbiological methods. 74 (2008).

DOI: 10.1016/j.mimet.2007.08.005

[7] W. Tanthapanichakoon, M. Hata, K. -h. Nitta, M. Furuuchi, Y. Otani, Mechanical degradation of filter polymer materials: Polyphenylene sulfide, Polymer Degradation and Stability. 91 (2006) 2614-2621.

DOI: 10.1016/j.polymdegradstab.2006.05.005

[8] B.H. Park, M. -H. Lee, S.B. Kim, Y.M. Jo, Evaluation of the surface properties of PTFE foam coating filter media using XPS and contact angle measurements, Applied Surface Science. 257 (2011) 3709-3716.

DOI: 10.1016/j.apsusc.2010.11.116

[9] M. Lupión, F.J. Gutiérrez Ortiz, B. Navarrete, V.J. Cortés, Assessment performance of high-temperature filtering elements, Fuel. 89 (2010) 848-854.

DOI: 10.1016/j.fuel.2009.04.016

[10] S. Fotovati, H. Vahedi Tafreshi, A. Ashari, S.A. Hosseini, B. Pourdeyhimi, Analytical expressions for predicting capture efficiency of bimodal fibrous filters, Journal of Aerosol Science. 41 (2010) 295-305.

DOI: 10.1016/j.jaerosci.2010.01.002

[11] A. Podgórski, A. Bałazy, L. Gradoń, Application of nanofibers to improve the filtration efficiency of the most penetrating aerosol particles in fibrous filters, Chemical Engineering Science. 61 (2006) 6804-6815.

DOI: 10.1016/j.ces.2006.07.022

[12] S.A. Hosseini, H.V. Tafreshi, 3-D simulation of particle filtration in electrospun nanofibrous filters, Powder Technology. 201 (2010) 153-160.

DOI: 10.1016/j.powtec.2010.03.020

[13] J. Wang, S.C. Kim, D.Y.H. Pui, Figure of Merit of Composite Filters with Micrometer and Nanometer Fibers, Aerosol Science and Technology. 42 (2008) 722-728.

DOI: 10.1080/02786820802249133

[14] S. Lingaiah, K. Shivakumar, Electrospun high temperature polyimide nanopaper, European Polymer Journal. 49 (2013) 2101-2108.

DOI: 10.1016/j.eurpolymj.2013.04.030

[15] D. Chen, R. Wang, W.W. Tjiu, T. Liu, High performance polyimide composite films prepared by homogeneity reinforcement of electrospun nanofibers, Composites Science and Technology. 71 (2011) 1556-1562.

DOI: 10.1016/j.compscitech.2011.06.013

[16] S. Jiang, G. Duan, J. Schöbel, S. Agarwal, A. Greiner, Short electrospun polymeric nanofibers reinforced polyimide nanocomposites, Composites Science and Technology. 88 (2013) 57-61.

DOI: 10.1016/j.compscitech.2013.08.031

[17] C. Qin, J. Wang, S. Cheng, X. Wang, L. Dai, G. Chen, Fluorescent performance of electrospun polyimide web mixed with hemicyanine dye, Materials Letters. 63 (2009) 1239-1241.

DOI: 10.1016/j.matlet.2009.02.038

[18] S.S. Homaeigohar, K. Buhr, K. Ebert, Polyethersulfone electrospun nanofibrous composite membrane for liquid filtration, Journal of Membrane Science. 365 (2010) 68-77.

DOI: 10.1016/j.memsci.2010.08.041

[19] S. -Y. Tsou, H. -S. Lin, P. -J. Cheng, C. -L. Huang, J. -Y. Wu, C. Wang, Rheological aspect on electrospinning of polyamide 6 solutions, European Polymer Journal. 49 (2013) 3619-3629.

DOI: 10.1016/j.eurpolymj.2013.07.031